Celebs like Tiger Woods get busted for their extramarital sexual exploits and then claim an addiction to sex. But what’s the difference between a bad boy and a true sex problem? And how do you know if your guy is a sex addict? Here are 10 clues that might explain his suspicious behavior. Plus, how much do you like sex? Take our quiz to find out...

Ever since David Duchovny and Tiger Woods checked themselves into to a sex addiction treatment center, a lot of women might be wondering if their guy is hiding secrets.

After all, if some of the most famous people could conceal their cheating for years, who’s to say regular guys couldn’t?

It’s hardly news that men like sex. But that perception – and expectation – can make it tough for women to figure out what’s normal and not when it comes to their man’s sexual demands.

According to research by pioneering sex addiction researcher/therapist Patrick Carnes, about 3%-6% of American men and women have a sexual compulsion.

Even if you catch your man cheating, how do you know if he’s acting out a compulsion or just being a player?

Motivation is the key difference between an addict and a womanizer, experts say.

The latter is feeding his ego with conquests. A sex addict turns to porn or anonymous hookups the way an alcoholic reaches for scotch.

“Someone else might go for a run, call a friend or zone out with TV,” explains Lisa Paz, Ph.D., a Miami marriage and family therapist. “The sex addict relies on sex to release stress and stabilize their mood.”

So if your partner has been unfaithful or is acting suspicious, how can you tell if sex addiction is to blame? Check out these top 10 warning signs:

1. He’s glued to the computer.In the past, men didn’t have many visual sex outlets – just a magazine or video.

Enter the internet, where the ever-changing, largely free buffet of online porn keeps many addicts well fed, says Robert Weiss, LCSW, founder and director of the Los Angeles-based Sexual Recovery Institute.

If your man starts spending hours online, behind closed doors, with vague explanations about how he’s working or surfing, there may be more going on.

“[Sex addicts] look at porn 3-4 hours a day, 4-5 days a week,” Weiss says. “They lose time for recreation, family and other interests.”

It’s the combination of unlimited porn options and sexual arousal that keeps them hooked.

“It becomes this endless hunt for the next exciting thing, and that's very addictive,” he says.

2. His porn stash is bigger than Hef’s. Finding a Playboy in the bathroom or dirty DVDs in the closet doesn’t mean he’s an addict.

But it’s a red flag if it’s shockingly hardcore (to you) or if his porn pile rivals a library's collection of books, says Weiss.

If he tells you the stash is his only sexual secret and you discover he’s lied and there’s more – for example, chat rooms, phone sex or massages with “happy endings” – be worried.

3. He always flakes on plans or runs late.Sex addiction is a huge time suck, which could lead to a pattern of broken commitments.

“Part of him knows it would be better to do something else,” explains Manhattan relationship therapist Michael Batshaw, LCSW. “That’s the compulsive part.”

4. Hearing “Not tonight” makes him moody.Nobody likes to be rejected and you don’t need to be a psychologist to know that most guys are happier and more relaxed after sex.

It’s even understandable if he’s a little antsy if it’s been a while since you two have done a mambo between the sheets.

But a sex-addicted man probably will crave it – like a smoker who’s gone too long without a cigarette – and will get irritable if denied.

Without sex, “there’s a palpable edginess, a nastiness, as if he needs a fix,” Paz says.

How long before the nastiness kicks in?

“For some, it will be a day [sans sex], for others every couple of days,” she says. “It depends on how advanced the addiction is.”

5. He acts like he’s directing –and starring in –a porn flick.Some addicts suddenly want sex with their partners all the time, but when they’re having it, the emotional connection’s missing.

“There’s no loving in it,” Batshaw notes. “It’s all about the release.”

Another tell-tale sign: His sexual requests are getting freakier.

“This is a pervasive, persistent request to up the ante,” not couples deciding to try new things, Paz says.

Just like with other types of addicts, he may need increasing amounts of sex to feed his high. That’s the progressive nature of addiction.

If conventional sex – doing and looking at it – no longer arouses him, he may need more provocative imagery and deviant sex (perhaps to act out what he’s seen) to get excited.

6. Your best come-ons have no effect.If he’s feeding his addiction elsewhere – whether through porn or physical encounters with others – he may lose interest in sex with you.

Or he may be ready and willing, but unable to finish.

“If suddenly he isn’t able to climax during regular sex with you, that’s a sign he’s desensitized himself to healthy one-on-one sex,” Paz says.

“Minus the camera angles, the thrill of getting caught or the anonymity – whatever the addiction is – he has a harder time climaxing.”

For some sex addicts, intercourse is almost beside the point. They get a thrill from planning, hunting and anticipation – not the act.

“It’s all about the looking, secrecy [and] double life,” Weiss says.

Besides, addicts usually feel a lot of shame after sex is over, he says. “Why would they want to bring that on?”

7. You notice some financial fishiness.Money missing from the bank account, unfamiliar credit charges or a card you didn’t know existed are all signs that something’s wrong.

About 60% of sex addicts get themselves into financial trouble, spending fortunes to feed their habit, according to the Sexual Recovery Institute.

Also watch out for strange monthly charges even if they seem innocent, Paz advises.

“A lot of these porn sites, phone sex services and prostitutes don’t show up on bills with names like Boobs R Us,” she says. “They’re listed with benign company names.”

8. He’s fighting other demons.Studies show that sex addicts often have multiple addictions.

Some organizations, including the Sexual Recovery Institute, estimate that 83% also have problems with substance abuse, eating disorders, compulsive shopping or gambling.

“You should be more worried if you notice your partner is also drinking heavily, gambling too much or shopping compulsively,” Batshaw says.

“It means that compulsivity is part of his personality," he says. "And he’s looking to get his need met in a variety of ways.”

9. He’s not over his troubled childhood.Dig into his background a little.

What was his childhood home life like? Sex addicts often come from families where at least one parent has an addiction.

Plus, ask whether his parents were sexually repressive or permissive.

It’s not unusual for sex addicts to grow up in homes where attitudes about sex weren’t healthy – either with few boundaries or many taboos.

In many cases, childhood sexual, physical or emotional abuse or neglect is a possibility.

Sex addiction can also develop when kids have a fear of failure or face intense pressure to excel as a student, artist or athlete.

“Addiction is a response to shame,” Batshaw explains. “Some teens drink or smoke pot to relieve feelings of not being good enough; others cope by masturbating.”

But how does masturbation develop into addiction?

“Compulsive masturbation can start with a kid who’s really controlled and has a tremendous amount of anxiety,” he says. Once puberty hits, the major way to reduce anxiety is masturbation.

The information contained on www.lifescript.com(the "Site") is provided for informational purposes only and is not meant to substitute for advice from your doctor or health-care professional. This information should not be used for diagnosing or treating a health problem or disease, or prescribing any medication. Always seek the advice of a qualified health-care professional regarding any medical condition. Information and statements provided by the site about dietary supplements have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease. Lifescript does not recommend or endorse any specific tests, physicians, third-party products, procedures, opinions, or other information mentioned on the Site. Reliance on any information provided by Lifescript is solely at your own risk.